1999 jeep grang chorokee front drive not working.Full time 4wd(transfer case has 4hi and 4lo). The transmission shifts well and there are no unusual noises when running. Any ideas? Bill Mulkerin [email protected]

what are tires touching,??????

• pavement
• snow
• ice
• dirt or what. sorry cant see you drive wrong. (blusH)

shift down what? , the 5 speed manual box?
or 4H to 4L transfer case lever??

part time 4wd does not allow running on pavement.
only , ICE or dirt that is the PART time words. meaning.
full time 4wd or AWD is a whole other matter and what your truck has I Can not guess.
is this your first ever 4wd experience?
when ICE covers pavement that is ICE , not pavement tires touch>
see?


this?
SR5 VERSION? NONE TOLD.
"V6 Shift on the fly Multi-Mode 4WD, V8 Full-Time 4WD"

"Torsen limited slip center differential, lockable in H4 or L4
STAY OUT OF LOCK, UNTIL YOU LEARN NOW. (DANGER)

ok if YES< only use Full time mode, never 4Hi part time on pavement.
if you do this wrong damage to transfer case happens
or worse skid off round.. nasty.
us AWD or full time, only
for 4Hi or 4Low or lock mode, only off road or ON ice.
see???????

LOCK TURNS THE CAR INTO A WW2 JEEP,
OR LIKE MY WRANGLER (OWNED 3) AND MORE.CHEROKEE'S; PT 4WD, AND LOTS OF DRIVING IN DEEP SNOW ME, BACK WHEN.
DOING IT WRONG , WINDS UP BOTH FRONT AND REAR AXLES.
CURE THAT MOVE ONE OR MORE TIRES ONTO DIRT./GRAVEL.
NOW SHIFT OUT OF LOCK AT 1/4 MPH (MEANS CRAWL)
SHIFT TO 2WD OR AWD. NOT 4hI OR 4LOW.AND NOT LOCK

Does placing it in neutral put the entire drive in neutral???? Yes . Taking the vehicle to a qualified repair shop that has a factory or professional scan tool to read code's in the transfer case control module is what you should do , you probably have no clue of the complexity of these 4X4 systems . How many buttons on the switch on the instrument panel ?
The BW 4493/4494 transfer case features a 4-button shift control switch (1) located on the instrument panel. When the vehicle has the ignition key in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria have been met and the new mode/gear position has been reached, or has been engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.

During normal driving situations, the transfer case operates in the 4HI mode. When the 4HI mode is selected, the transfer case shift control module sends 12-volts to an electrical motor, which is the transfer case encoder motor. This motor rotates the transfer case shift detent lever shaft which moves the shift forks and range sleeve to obtain different modes/ranges.
The BW 4493/4494 transfer case has the added feature of also providing the driver with 3 manual mode/range positions:
• 4HI - 4-Wheel Drive High Open
• 4HI Lock - 4-Wheel Drive High Locked
• 4LO Lock - 4-Wheel Drive Low Locked
The driver may choose to select any of these mode/range positions while driving the vehicle. However, the transfer case will not allow a shift into or out of 4LO Lock unless the following criteria has been met:

DTC B0790 Transfer Case Neutral Indicator Circuit Malfunction
DTC B2725 ATC Mode Switch Circuit Malfunction
The mode switch circuit consists of 5 modes. The transfer case shift control module supplies a regulated 5 volts, DC to the switch through the 5-volt regulator circuit. The current travels through the resistor of the currently pressed mode button. The current is then returned to the transfer case shift control module through the switch signal circuit.
The transfer case shift control module constantly monitors this signal voltage to determine the condition of the mode switch circuit.
When each of the modes are selected they will complete a circuit through their own specific resistor while the button is pressed. The transfer case shift control module continuously monitors the switch input to determine whether the Neutral, Differential Lock, 4HI, 4HI Lock, or 4LO Lock mode was selected by the driver.

DTC C0306 Motor A or B Circuit Malfunction
The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized, through motor control A or motor control B, the ground is provided by the opposing motor control circuit and then grounded through the transfer case shift control module ground circuit, the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between the following ranges:
• 4HI
• 4HI Lock
• 4LO Lock
• Neutral
This DTC detects an open, short to voltage, or short to ground in the motor control A or motor control B circuits, or an open, or short to ground inside the motor.

DTC C0327 Encoder Circuit Malfunction
DTC C0329
DTC C0359
DTC C0550

The Borg Warner (BW) model 4493/4494 NR4 transfer case is a 2-speed, full-time 4WD, transfer case. The transfer case has an external planetary type differential, which has 2 different sets of pinion gears. The planetary differential provides a 40/60 torque split front/rear full-time. This means the front and rear propeller shafts are constantly being driven for maximum traction in all conditions. A high/low planetary carrier assembly provides the high and low ranges, which is a 6-pinion gear, sun gear, and annulus gear arrangement, giving a 2.64 low range reduction ratio in the BW 4493 and a 4:1 ratio in the BW 4494.

are you on pavement, or offroad.?
99 Cherokee what transfer case?
if Part time system. then,.
are your tires on ice or dirt?
if not its cockpit error.
read the operators guide, on this.
if on ICE,say so, we can not know what transfer case you have
nor what tires are sitting on.
do tell, and we can tell you what good or bad.

here is the build list for these years XJ
what do you have. ?
The full time box, must not be in 4Lo , on pavement
unless it too is on ice .

All the transfer cases used on the Cherokee were chain driven with aluminium housings. Command-Trac was standard on XJ models built with 4WD.

• 1984-1987: New Process NP207 Command-Trac, part-time only, 2.61:1 ratio with low range
• 1984-1986: New Process NP228/229 Selec-Trac, full- or part-time, 2.61:1 ratio with low range

NP228/229 has a vacuum switch for 2WD-4WD selection on the fly and a separate manual lever for low range

• 1987-2001: New Process NP231 Command-Trac, part-time only, 2.72:1 ratio with low range

NP231 has the following settings: 2HI, 4HI, N, 4LO

• 1987-2001: New Process NP242 Selec-Trac, full-time or part-time, 2.72:1 ratio with low range

NP242 has the following settings: 2HI, 4 full-time, 4 part-time, N, 4LO

-----------------------------------
never post questions on 4wd unless you know what is there.
the transfer case, also has tag , telling what it is.

Hello guy
try posting what 4wd system you have,? first.
command trac or select track, (the latter is full time)
part time or the full time system,
we cant guess it....
read the operators guide first, if a part time system only
as i suspect, stop driving on dry pavement.
it's only for ice, or dirt. part time. part time is not a full time system.
Command-Trac
shifting to 4wd on dry (means no ice) pavement causes, drive line wind up! and the gears to lockup. (see steering get tight in turns?> and is dangerous to drive it like this , you, me and the box)
posted here 100s of times.

http://www.rubicon-trail.com/4WD101/driveline-bind.html


the non grand Cherokee. early

had these choices

• 1987-2001: New Process NP231 Command-Trac, part-time only, 2.72:1 ratio with low range

NP231 has the following settings: 2HI, 4HI, N, 4LO

• 1987-2001: New Process NP242 Selec-Trac, full-time or part-time, 2.72:1 ratio with low range

NP242 has the following settings: 2HI, 4 full-time, 4 part-time, N, 4LO


as you can see you need to first know, what NP box you have or
photo your shift lever for 4wd, an post it and we tell you.

more facts, on select trac. (totally unlike command trac)
Selec-Trac locking hub is used on 4WD Cherokee. Selec-Trac
utilizes a non-disconnect front axle. Engagement of 2WD or 4WD is
accomplished at transfer case by means of mechanical shift linkage.
System allows full or part time 4WD. Selec-Trac can be shifted into
2WD or 4WD modes from inside the vehicle at any speed.
unquote
next from the service manual,
4WD TO 2WD
1) Place mode select switch in 2WD position. Transfer case
should shift to 2WD and not allow shifting into 4WD or LO range. Axle
should shift after transfer case shifts.
2) To determine if front axle has completed a shift out of
4WD into 2WD, position mode select switch back to 4WD position while
operating vehicle at slow speed. If vehicle shifts into 2WD, axle will
ratchet. If shift is not completed, transfer case will shift into 4WD
and hissing sound will come from mode select switch.
end quote.

if unsure read the FSM book its free.
shows you both systems and how to diagnose it.

in the box, click Cherokee,,then click 1993, and behold.
the real deal.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

I guess you probably don't know what transfer case you have ?
SERVICE 4WD
Refer to
?€¢
Transfer Case Description and Operation in Transfer Case - NVG 149-NP3

?€¢
Transfer Case Description and Operation in Transfer Case - NVG 246-NP8

?€¢
Transfer Case Description and Operation in Transfer Case - NVG 261-NP2

?€¢
Transfer Case Description and Operation in Transfer Case - NVG 263-NP1

The NVG 246 EAU provides 5 modes, Auto 4WD, 4HI, 4LO, 2HI and Neutral.
The four manual mode, or range gear positions, of the NVG 261 transfer case are:
?€¢
2HI - 2 wheel drive high range

?€¢
4HI - 4 wheel drive high range, part-time

?€¢
4LO - 4 wheel drive low range, 2.72:1 gear ratio reduction

?€¢
N - Neutral, 4 wheel

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
?€¢
2HI - 2 Wheel Drive high range

?€¢
4HI - 4 Wheel Drive high range

?€¢
4LO - 4 Wheel Drive low range

?€¢
Neutral

With the info I've given you ,you should be able too now !
There is probably a code stored somewhere !
DTC B0790 DTC B2725 DTC C0300 DTC C0305 DTC C0306 DTC C0321 DTC C0327 DTC C0359 DTC C0374 DTC C0379 DTC C0550.

THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.

Are you having trouble shifting into 4wd?

Some of the GrandCherokees come with full time 4wheel drive viscous coupling inside of the transfer case and some have teh 242 TC which allow you siwtch between 2wd, 4hi, N, 4lo.

the transfer case module is bad it is bolted to transfer case above front drive shaft

If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.